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Signed-off-by: Jie Gan --- drivers/hwtracing/coresight/coresight-tmc-core.c | 53 ++++++++++++++++++++= +++- 1 file changed, 52 insertions(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-core.c b/drivers/hwt= racing/coresight/coresight-tmc-core.c index 32ca2ec994de..95c74405ce05 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-core.c +++ b/drivers/hwtracing/coresight/coresight-tmc-core.c @@ -31,6 +31,7 @@ =20 #include "coresight-priv.h" #include "coresight-tmc.h" +#include "coresight-ctcu.h" =20 DEFINE_CORESIGHT_DEVLIST(etb_devs, "tmc_etb"); DEFINE_CORESIGHT_DEVLIST(etf_devs, "tmc_etf"); @@ -228,15 +229,47 @@ static int tmc_prepare_crashdata(struct tmc_drvdata *= drvdata) return 0; } =20 +/* Return the byte-cntr's tmc_sysfs_ops if in using */ +static const struct tmc_sysfs_ops *tmc_get_byte_cntr_sysfs_ops(struct tmc_= drvdata *drvdata) +{ + struct ctcu_byte_cntr *byte_cntr_data; + struct ctcu_drvdata *ctcu_drvdata; + struct coresight_device *helper; + int port; + + helper =3D tmc_etr_get_helper_device(drvdata, CORESIGHT_DEV_SUBTYPE_HELPE= R_CTCU); + if (!helper) + return NULL; + + port =3D coresight_get_in_port(drvdata->csdev, helper); + if (port < 0) + return NULL; + + ctcu_drvdata =3D dev_get_drvdata(helper->dev.parent); + byte_cntr_data =3D &ctcu_drvdata->byte_cntr_data[port]; + if (byte_cntr_data && byte_cntr_data->thresh_val) + return ctcu_drvdata->byte_cntr_sysfs_ops; + + return NULL; +} + static int tmc_read_prepare(struct tmc_drvdata *drvdata) { + const struct tmc_sysfs_ops *byte_cntr_sysfs_ops; int ret =3D 0; =20 + byte_cntr_sysfs_ops =3D tmc_get_byte_cntr_sysfs_ops(drvdata); + if (byte_cntr_sysfs_ops) { + ret =3D byte_cntr_sysfs_ops->read_prepare(drvdata); + goto out; + } + if (drvdata->sysfs_ops) ret =3D drvdata->sysfs_ops->read_prepare(drvdata); else ret =3D -EINVAL; =20 +out: if (!ret) dev_dbg(&drvdata->csdev->dev, "TMC read start\n"); =20 @@ -245,13 +278,21 @@ static int tmc_read_prepare(struct tmc_drvdata *drvda= ta) =20 static int tmc_read_unprepare(struct tmc_drvdata *drvdata) { + const struct tmc_sysfs_ops *byte_cntr_sysfs_ops; int ret =3D 0; =20 + byte_cntr_sysfs_ops =3D tmc_get_byte_cntr_sysfs_ops(drvdata); + if (byte_cntr_sysfs_ops) { + ret =3D byte_cntr_sysfs_ops->read_unprepare(drvdata); + goto out; + } + if (drvdata->sysfs_ops) ret =3D drvdata->sysfs_ops->read_unprepare(drvdata); else ret =3D -EINVAL; =20 +out: if (!ret) dev_dbg(&drvdata->csdev->dev, "TMC read end\n"); =20 @@ -277,6 +318,12 @@ static int tmc_open(struct inode *inode, struct file *= file) static ssize_t tmc_get_sysfs_trace(struct tmc_drvdata *drvdata, loff_t pos= , size_t len, char **bufpp) { + const struct tmc_sysfs_ops *byte_cntr_sysfs_ops; + + byte_cntr_sysfs_ops =3D tmc_get_byte_cntr_sysfs_ops(drvdata); + if (byte_cntr_sysfs_ops) + return byte_cntr_sysfs_ops->get_trace_data(drvdata, pos, len, bufpp); + return drvdata->sysfs_ops->get_trace_data(drvdata, pos, len, bufpp); } =20 @@ -297,7 +344,11 @@ static ssize_t tmc_read(struct file *file, char __user= *data, size_t len, return -EFAULT; } =20 - *ppos +=3D actual; + if (drvdata->reading_node) + drvdata->reading_node->pos +=3D actual; + else + *ppos +=3D actual; + dev_dbg(&drvdata->csdev->dev, "%zu bytes copied\n", actual); =20 return actual; --=20 2.34.1